Microsoft and Macrovision, the copy-protection company, have struck a deal that will add a new layer of anticopying defenses to video content being swapped between Windows-based home devices, CNET News reported.

Microsoft has licensed Macrovision’s technology, which aims to stop people from making copies using analog connections between devices, such as those that typically link a set-top box to a television.

The deal is designed to make it harder for Windows PC users to make permanent copies of TV shows and movies without permission. It also was conceived to help convince movie studios and other content producers to release their products online, the CNET report said.

Brad Brunell, Microsoft’s general manager of intellectual-property licensing, said that the studios would offer more interesting products over the Internet using this technology in the long term.

Most copy-protection technologies are aimed at preventing digital replication, since a digital copy can be identical to the original. However, modern analog copying can also have high-quality results, and Hollywood studios have worried that their products could be easily copied using methods such as recording the output of a DVD player onto a computer hard drive.

The Macrovision technology has been one attempt to limit this. Rather than scrambling the signal altogether, as digital copy protection typically does, it includes a pulse of electronic energy along with the video as it is played. The pulse is meant to indicate the content should not be recorded. Many devices such as DVD recorders respect this signal and block recording if it is detected.

Under the new deal, Microsoft’s Windows Media software will recognize this signal when it is included in incoming analog video streams. For upcoming versions of its Microsoft’s Media Center Edition operating systems, the computer will allow users to make a temporary copy that can be stored one day, but that cannot be used after that time.

In future versions of its Media software, including the version in its next Longhorn operating system, Microsoft plans to support an upcoming revision of Macrovision’s technology that will allow content to be stored for just 90 minutes, or up to a week.

TiVo is also moving to support the new Macrovision technology. Movie studios have discussed using the more flexible version for different pay-per-view content rules.